Protect shared affinity table with mutex

[urcu.git] / test_rwlock.c

diff --git a/test_rwlock.c b/test_rwlock.c
index b7909019f8b1df843e25512bad4367d427a1bbfe..4cc4c07f953dc5f1ae4d43ce96fb860bcc3f5f55 100644 (file)
--- a/test_rwlock.c
+++ b/test_rwlock.c
@@ -98,22 +98,33 @@ static unsigned int cpu_affinities[NR_CPUS];
 static unsigned int next_aff = 0;
 static int use_affinity = 0;
 
+pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
+
 static void set_affinity(void)
 {
        cpu_set_t mask;
        int cpu;
+       int ret;
 
        if (!use_affinity)
                return;
 
+       ret = pthread_mutex_lock(&affinity_mutex);
+       if (ret) {
+               perror("Error in pthread mutex lock");
+               exit(-1);
+       }
        cpu = cpu_affinities[next_aff++];
+       ret = pthread_mutex_unlock(&affinity_mutex);
+       if (ret) {
+               perror("Error in pthread mutex unlock");
+               exit(-1);
+       }
        CPU_ZERO(&mask);
        CPU_SET(cpu, &mask);
        sched_setaffinity(0, sizeof(mask), &mask);
 }
 
-
-
 /*
  * returns 0 if test should end.
  */